WPF实战之一 桌面消息框（右下角消息弹出框）

此版本是根据别人的项目改造的，记录下笔记

原文：https://blog.csdn.net/catshitone/article/details/75089069

一、即时弹出

1.创建弹出框

新建一个100*300的WPF页面NotificationWindow.Xaml

 <Grid Background="AliceBlue">
        <Button Click="Button_Click" Content="Close" HorizontalAlignment="Left" Margin="225,0,0,0" VerticalAlignment="Top" Width="75"/>
        <TextBlock x:Name="tbTitle" HorizontalAlignment="Left" Margin="31,16,0,0" TextWrapping="Wrap" Text="TextBlock" VerticalAlignment="Top"/>
        <TextBlock x:Name="tbContent" HorizontalAlignment="Left" Margin="31,42,0,0" TextWrapping="Wrap" Text="TextBlock" VerticalAlignment="Top"/> 
    </Grid>

后置页代码

 public partial class NotificationWindow : Window
    {
        public double TopFrom
        {
            get; set;
        }
        public NotificationWindow()
        {
            InitializeComponent();
            this.Loaded += NotificationWindow_Loaded;
        }

        private void NotificationWindow_Loaded(object sender, RoutedEventArgs e)
        {
            NotifyData data= this.DataContext as NotifyData;
            if(data!=null)
            {
                tbContent.Text = data.Content;
                tbTitle.Text = data.Title;
            }
            NotificationWindow self = sender as NotificationWindow;
            if (self != null)
            {
                self.UpdateLayout();
                SystemSounds.Asterisk.Play();//播放提示声

                double right = SystemParameters.WorkArea.Right;//工作区最右边的值
                self.Top = self.TopFrom - self.ActualHeight;
                DoubleAnimation animation = new DoubleAnimation();
                animation.Duration = new Duration(TimeSpan.FromMilliseconds(500));//NotifyTimeSpan是自己定义的一个int型变量，用来设置动画的持续时间
                animation.From = right;
                animation.To = right - self.ActualWidth;//设定通知从右往左弹出
                self.BeginAnimation(Window.LeftProperty, animation);//设定动画应用于窗体的Left属性

                Task.Factory.StartNew(delegate
                {
                    int seconds = 5;//通知持续5s后消失
                    System.Threading.Thread.Sleep(TimeSpan.FromSeconds(seconds));
                    //Invoke到主进程中去执行
                    this.Dispatcher.Invoke(delegate
                    {
                        animation = new DoubleAnimation();
                        animation.Duration = new Duration(TimeSpan.FromMilliseconds(500));
                        animation.Completed += (s, a) => { self.Close(); };//动画执行完毕，关闭当前窗体
                        animation.From = right - self.ActualWidth;
                        animation.To = right;//通知从左往右收回
                        self.BeginAnimation(Window.LeftProperty, animation);
                    });
                });
            }
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            double right = SystemParameters.WorkArea.Right;
            DoubleAnimation animation = new DoubleAnimation();
            animation.Duration = new Duration(TimeSpan.FromMilliseconds(500));

            animation.Completed += (s, a) => { this.Close(); };
            animation.From = right - this.ActualWidth;
            animation.To = right;
            this.BeginAnimation(Window.LeftProperty, animation);
        }
    }

2.弹出消息

在主页面创建一个弹出按钮，事件如下

private void Button_Click(object sender, RoutedEventArgs e)
        {
            i++;
            NotifyData data = new NotifyData();
            data.Title = "这是标题:" + i;
            data.Content = "这是手动内容 ";
            showNotify(data);
        }

        private void showNotify(NotifyData data)
        { 
            NotificationWindow dialog = new NotificationWindow();//new 一个通知
            dialog.Closed += Dialog_Closed;
            dialog.TopFrom = GetTopFrom();
            dialog.DataContext = data;//设置通知里要显示的数据
            dialog.Show();

            _dialogs.Add(dialog);
        }

二、定时弹出

1.创建弹出框

　　和前面的第一步一样

2.创建事件通知接口

部分代码

 /// <summary>
    /// 事件通知接口
    /// </summary>
    public interface IEventNotify
    { 
        /// <summary>
        /// 事件通知
        /// </summary>
        void EventNotify(EventData eventData);
    }
     
    /// <summary>
    /// 事件数据实体
    /// </summary>
    public class EventData
    { 
        public EventNotifyType EventNotify { get; set; } 

        public object Data { get; set; } 
    }

3.实现定时消息

在消息管理类添加一个定时器，每隔3秒执行一次。

在Timer_Elapsed中，定时获取最新数据

public class NoticeManager : IDisposable
    {
        /// <summary>
        /// 定时器
        /// </summary>
        private readonly Timer _timer;
        public IMainEventCommnuicationHandler Handler { get; private set; }
         
        private int seconds = 1 * 3;

        public NoticeManager(IMainEventCommnuicationHandler handler)
        {
            Handler = handler;
            _timer = new Timer(seconds * 1000);
            _timer.Elapsed += Timer_Elapsed;
            _timer.Start();
             
        }

        /// <summary>
        /// 定时事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private async void Timer_Elapsed(object sender, ElapsedEventArgs e)
        { 
            for (int i = 0; i < 3; i++)
            {
                var notifyData = new NotifyData()
                {
                    Title = "标题" + i,
                    Content = DateTime.Now.AddHours(i).ToString()

                };
                EventData eventData = new EventData()
                {
                    EventNotify = EventNotifyType.New,
                    Data = notifyData
                };
                Handler.EventNotify(eventData);
            }
        }
         
        public void Dispose()
        {
            if (_timer != null)
            {
                _timer.Stop();
                _timer.Dispose();
            }
        }
    }

4.弹出消息

private NoticeManager noticeManager;
        private void Time_Click(object sender, RoutedEventArgs e)
        {
            if (noticeManager == null)
            {
                noticeManager = new NoticeManager(this);
                btnTime.Content = "暂停弹出"; 
            }
            else
            {
                btnTime.Content = "定时弹出";
                noticeManager.Dispose();
            }
        }


        public void EventNotify(EventData eventData)
        {
            if (eventData.EventNotify == EventNotifyType.New)
            {
                var data = eventData.Data as NotifyData;
                SendMessage(data);
            }
            else
            {
                MessageBox.Show("其他定时消息");
            }
        }

        /// <summary>
        /// 发出通知
        /// </summary>
        /// <param name="data"></param>
        void SendMessage(NotifyData data)
        {
            //此处调用Invoke，否则会报错：“ 调用线程必须为 STA,因为许多 UI 组件都需要 ”。
            App.Current.Dispatcher.Invoke(() =>
            {
                showNotify(data);
            });
        }

事件通知时不能直接使用UI组件，否则会报错：“ 调用线程必须为 STA,因为许多 UI 组件都需要 ”。

Dispatcher是一个线程控制器，反正你要控制线程里跑的东西，就要经过它。那么WPF里面，有个所谓UI线程，后台代码不能直接操作UI控件，需要控制，就要通过这个Dispatcher。

参考：https://www.cnblogs.com/xinaixia/p/5706096.html

demo下载：https://gitee.com/zmsofts/XinCunShanNianDaiMa/blob/master/NotificationDemoWPF.rar